8. Remove the bearing PWM amplifier from J1 of the Backplane.
4.28.4.2 PWM Amplifier Installation
NOTE
Prior to replacing a PWM, verify the bearing coils. Refer to Section 4.29.3.1 Bearing Coil Verification on page 230.
1. Clean the surface of the compressor where the heat sink plate contacts the housing and clean the
mating surface of the PWM if it is to be reused.
2. Spread a thin and uniform coat of Dow Corning Silicone Heat Sink paste (or equivalent) entirely over
the PWM mounting surface where it contacts the compressor housing.
3. Check that the M5x10 ground fastener at the lower right of the Backplane is tight before replacing the
PWM. Torque to 3 Nm (27 in.lb).
4. Align the heat sink of the PWM with the two (2) guide pins in the main compressor housing.
5. Insert the PWM into the J1 connector of the Backplane.
6. Secure the heat sink of the PWM to the main compressor housing with three M5x10 fasteners. Torque
to 4.5 Nm (40 in.lb.).
7. Ensure the heat sink of the PWM is firmly seated against the main compressor housing.
8. Connect the two (2) connectors for the PWM and bearing power feedthroughs.
9. Install the BMCC. Refer to Section 4.27 BMCC on page 220.
10. Install the Serial Driver. Refer to Section 4.26.4 Serial Driver Removal and Installation on page 218.
NOTE
Perform a bearing calibration after replacing the PWM to verify functionality. Refer to Section 5.3 Bearing Calibration on page 263.
11. Install Service Side Cover. Refer to Section 4.1.3.1 Service Side Cover Removal and Installation on page
12. Install top covers. Refer to Section 4.1 Compressor Covers on page 52.
13. Return the compressor to normal operation.
4.28.4.3 PWM Torque Specifications
Table 4-44 PWM Torque Specifications
Description
Nm
Ft.Lb.
In.Lb.
Backplane Mounting/Ground fastener, M5x10
3
-
27
PWM Mounting/heatsink fastener, M5x10
4.5
-
40
Cover fastener, M5x15
1.5
-
13
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Summary of Contents for Turbocor TT Series
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